Welcome to Icy Phoenix!
It'll help us more if you can provide more information about the style you are using.
Of course i am using phpbb 3.0.5 and phpbb portal 1.2.2 and theme wowking 1.0.9
Go to your forum folder from FTP and go to the styles imageset. There will be sub folders for the installed languages. You have to have all the buttons in the default language you installed in any additional languages. You can just make a new folder, then copy all the button images there.
And as Chaotic mentioned, this is not the place to request help for styles other than those created by Mighty Gorgon in the first place. phpBB support forums are the place for that.